Messages in this thread | | | Date | Mon, 1 Jan 1990 07:11:45 +0100 | From | Pavel Machek <> | Subject | Re: High-availability question |
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Hi!
> Hope this is not too much off-topic. I have a client who wants to setup a > high-availability linux server network. It's an ISP, so we're talking > mail/web/ftp/dns/etc. I would like to have 2 identical boxes, with > identical harddisks partitioned the same way, and to have the main box > constantly synchronize it's filesystem with the standby box, so that when > it fails, the standby just does an IP takeover, and has all the recent data > in place. I would really like to do this on the lowest possible level, > something like 'write this block to head x, cylinder y', instead of doing > cp over nfs every 5 minutes or so. Is there anything available that would > do something like that? If not, how easy would adding this to the kernel > be? Can it be done it all? My idea was to have the standby box run a > custom init binary, that would just sync the disks and wait for the other > box to die. When it dies, it runs the real init, everything comes up, and > the box takes over.
raid1 over localdisk and nbd-mounted disk from other host is the answer.
Pavel PS: Of course, you'll need fsck before mounting read-write. -- I'm really pavel@ucw.cz. Look at http://195.113.31.123/~pavel. Pavel Hi! I'm a .signature virus! Copy me into your ~/.signature, please!
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